Streamlight's Scorpion flashlight is a powerhouse compact tactical flashlight with a beam of up to 6,500 candlepower. Triple action tail cap is a switch; variable spot to flood focus and encases a spare bulb. The batteries are two, 3 volt lithium cells (included) with a shelf life of nearly ten years and last about one hour of continuous use. The Streamlight Scorpion LED features an anti roll head and a one watt Luxeon LED set in a polished reflector for 42 lumen output. The batteries typically have 1-3/4 hours of maximum brightness run time at regulated maximum intensity and an additional two hours of declining usable output.